113x [ADDON_ACTION_BLOCKED] AddOn 'NimhfreeUI' tried to call the protected function '

[Nimhfree]

When encountering bosses I get:

113x [ADDON_ACTION_BLOCKED] AddOn 'NimhfreeUI' tried to call the protected function 'Boss1TargetFrame:SetPoint()'

which I think is because of:

-- Move the target frame to the bottom left.
f=TargetFrame
f:SetMovable(1)
f:SetUserPlaced(true)
f:SetScale(.8)
f:ClearAllPoints()
f:SetPoint("LEFT",MultiBarRightButton7,"BOTTOMLEFT",0,100)

which is set up at the very start, so not in combat.

Anyone know how to do this properly?